| 140821 | December 14 | Event | 1941 – World War II: Japan signs a treaty of alliance with Thailand. |
| 140822 | December 14 | Event | 1946 – The United Nations General Assembly votes to establish its headquarters in New York, New York. |
| 140823 | December 14 | Event | 1947 – Santiago Bernabéu Stadium, home of Real Madrid C.F., staged its first football match. |
| 140824 | December 14 | Event | 1955 – Albania, Austria, Bulgaria, Cambodia, Ceylon, Finland, Hungary, Ireland, Italy, Jordan, Laos, Libya, Nepal, Portugal, Romania and Spain join the United Nations. |
| 140825 | December 14 | Event | 1958 – The 3rd Soviet Antarctic Expedition becomes the first to reach the southern pole of inaccessibility. |
| 140826 | December 14 | Event | 1961 – Tanganyika joins the United Nations. |
| 140827 | December 14 | Event | 1962 – NASA's Mariner 2 becomes the first spacecraft to fly by Venus. |
| 140828 | December 14 | Event | 1963 – The dam containing the Baldwin Hills Reservoir bursts, killing five people and damaging hundreds of homes in Los Angeles, California. |
| 140829 | December 14 | Event | 1964 – American Civil Rights Movement: Heart of Atlanta Motel v. United States – The Supreme Court of the United States rules that Congress can use the Constitution's Commerce Clause to fight discrimination. |
| 140830 | December 14 | Event | 1971 – Bangladesh Liberation War: Over 200 of East Pakistan 's intellectuals are executed by the Pakistan Army and their local allies. (The date is commemorated in Bangladesh as Martyred Intellectuals Day.) |
| 140831 | December 14 | Event | 1972 – Apollo program: Eugene Cernan is the last person to walk on the moon, after he and Harrison Schmitt complete the third and final extra-vehicular activity (EVA) of the Apollo 17 mission. |
| 140832 | December 14 | Event | 1981 – Arab–Israeli conflict: Israel's Knesset ratifies the Golan Heights Law, extending Israeli law to the occupied Golan Heights. |
| 140833 | December 14 | Event | 1983 – The third Congress of the Communist Youth of Greece starts. |
| 140834 | December 14 | Event | 1988 – The ET3 television network is launched in Thessaloniki, Greece. |
| 140835 | December 14 | Event | 1992 – War in Abkhazia: Siege of Tkvarcheli – A helicopter carrying evacuees from Tkvarcheli is shot down, resulting in at least 52 deaths, including 25 children. The incident catalyses more concerted Russian military intervention on behalf of Abkhazia. |
| 140836 | December 14 | Event | 1994 – Construction begins on the Three Gorges Dam on the Yangtze river. |
| 140837 | December 14 | Event | 1995 – Yugoslav Wars: The Dayton Agreement is signed in Paris by the leaders of the Federal Republic of Yugoslavia, Croatia, and Bosnia and Herzegovina. |
| 140838 | December 14 | Event | 1998 – Yugoslav Wars: The Yugoslav Army ambushes a group of Kosovo Liberation Army fighters attempting to smuggle weapons from Albania into Kosovo, killing 36. |
| 140839 | December 14 | Event | 1999 – Torrential rains cause flash floods in Vargas, Venezuela, resulting in tens of thousands of deaths, the destruction of thousands of homes, and the complete collapse of the state's infrastructure. |
| 140840 | December 14 | Event | 2003 – Pakistani President Pervez Musharraf narrowly escapes an assassination attempt. |
| 140841 | December 14 | Event | 2004 – The Millau Viaduct, the tallest bridge in the world, is formally inaugurated near Millau, France. |
| 140842 | December 14 | Event | 2008 – Muntadhar al-Zaidi throws his shoes at then-U.S. President George W. Bush during a press conference in Baghdad, Iraq. |
| 140843 | December 14 | Event | 2012 – Sandy Hook Elementary School shooting: Twenty-eight people, including the gunman, are killed in Sandy Hook, Connecticut. |
| 140844 | December 14 | Event | 2013 – A reported coup attempt in South Sudan leads to continued fighting and hundreds of casualties. |
| 140845 | December 14 | Birth | 1009 – Emperor Go-Suzaku of Japan (d. 1045) |
| 140846 | December 14 | Birth | 1332 – Frederick III, Landgrave of Thuringia (d. 1381) |
| 140847 | December 14 | Birth | 1546 – Tycho Brahe, Danish astronomer and chemist (d. 1601) |
| 140848 | December 14 | Birth | 1607 – János Kemény, Hungarian prince (d. 1662) |
| 140849 | December 14 | Birth | 1625 – Barthélemy d'Herbelot, French orientalist and academic (d. 1695) |
| 140850 | December 14 | Birth | 1631 – Anne Conway, Viscountess Conway, English philosopher and author (d. 1679) |